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HAZLETON, PA - MAY 15:  Sports trophies and an antique fire hose are seen behind voting booths at the Hazleton Southside Fire Station polling station for the 2018 Pennsylvania Primary Election on May 15, 2018 in Hazleton, Pennsylvania.  In the second major May primary day nationwide, four states go to the polls: Idaho, Nebraska, Oregon, and Pennsylvania.  (Photo by Mark Makela/Getty Images)
HAZLETON, PA - MAY 15:  Sports trophies and an antique fire hose are seen behind voting booths at the Hazleton Southside Fire Station polling station for the 2018 Pennsylvania Primary Election on May 15, 2018 in Hazleton, Pennsylvania.  In the second major May primary day nationwide, four states go to the polls: Idaho, Nebraska, Oregon, and Pennsylvania.  (Photo by Mark Makela/Getty Images)

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    What to watch for in PA primaries

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What to watch for in PA primaries

CNN's Chris Cillizza explains what and who you should look out for in the Pennsylvania primaries.

What to watch for in PA primaries

CNN's Chris Cillizza explains what and who you should look out for in the Pennsylvania primaries.